LAWRENCEVILLE, Ga. — The Democratic National Committee has apologized after one of its campaign buses was spotted dumping raw sewage along a road outside Atlanta.

News outlets report a Lawrenceville auto shop employee alerted police Tuesday morning after witnessing the sewage getting dumped into a storm drain. The bus, which bears the slogan "Forward Together" and features the likenesses of presidential candidate Hillary Clinton and running mate Tim Kaine, was in town for an early voting event.

The DNC apologized in a statement, calling it "an honest mistake." A representative later said the sewagecontainer was full and the driver was concerned about the contents leaking.

Gwinnett County fire hazmat crews cleaned up the spill, which included a large amount of drying toilet paper on the roadway. Georgia's Environmental Protection Division is investigating.